The SOPHIE Spectrograph: Design and Technical Key-Points for High Throughput and High Stability
Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE(2008)
Observ Haute Provence
Abstract
SOPHIE is a new fiber-fed echelle spectrograph in operation since October 2006 at the 1.93-m telescope of Observatoire de Haute-Provence. Benefiting from experience acquired on HARPS (3.6-m ESO), SOPHIE was designed to obtain accurate radial velocities (~3 m/s over several months) with much higher optical throughput than ELODIE (by a factor of 10). These enhanced capabilities have actually been achieved and have proved invaluable in asteroseismology and exoplanetology. We present here the optical concept, a double-pass Schmidt echelle spectrograph associated with a high efficiency coupling fiber system, and including simultaneous wavelength calibration. Stability of the projected spectrum has been obtained by the encapsulation of the dispersive components in a constant pressure tank. The main characteristics of the instrument are described. We also give some technical details used in reaching this high level of performance.
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Key words
Instrumentation,optical design,spectrograph,fiber-fed spectrograph,echelle spectrograph,scrambler,radial velocity,exoplanets,asteroseismology
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